Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Investments in Affordable Housing Projects [Abstract]
Investment for qualified affordable housing projects included in other assets	$ 13,401,000		$ 13,401,000		$ 14,149,000
Unfunded commitments related to the investments in qualified affordable housing projects	3,913,000		3,913,000		$ 5,634,000
Recognized amortization expense	252,000	$ 239,000
Recognized tax credits and other benefits from its investment in affordable housing tax credits	426,000	396,000
Impairment losses related to its investments in qualified affordable housing projects	$ 0	$ 0	$ 0	$ 0